Calculation
I = P / U
I = P/U; at constant power, current falls as voltage rises.
P = U·I
Convert watts to amperes
I = P/U; at constant power, current falls as voltage rises.
MINTSI
02
Result
Select a target and calculate.
Technical principle schematic
Understand the inputs
- Supply voltage U — Rated voltage at the load.
- Current I — Required operating current for electrical sizing.
- Equivalent resistance R — Helper value for an ohmic load; do not use alone for motors.
- Power P — Rated or real load power.
Example
2,300 W at 230 V require 10 A (ohmic load).
Assumptions and limits
Power factor 1; motor inrush, reactive power and harmonics are excluded.
Sources